package com.ydj.reggie.controller;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.ydj.reggie.common.R;
import com.ydj.reggie.dto.DishDto;
import com.ydj.reggie.entity.Category;
import com.ydj.reggie.entity.Dish;
import com.ydj.reggie.entity.DishFlavor;
import com.ydj.reggie.service.CategoryService;
import com.ydj.reggie.service.DishFlavorService;
import com.ydj.reggie.service.DishService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.web.bind.annotation.*;

import java.util.List;
import java.util.Set;
import java.util.concurrent.TimeUnit;
import java.util.stream.Collectors;

/**
 * @author ydj
 * @version 1.0
 */
@Slf4j
@RestController
@RequestMapping("/dish")
public class DishController {

    @Autowired
    private DishService dishService;

    @Autowired
    private CategoryService categoryService;

    @Autowired
    private DishFlavorService dishFlavorService;

    @Autowired
    private RedisTemplate redisTemplate;

    /**
     * 新增菜品
     *
     * @param dishDto
     * @return
     */
    @PostMapping
    public R<String> save(@RequestBody DishDto dishDto) {
        log.info(dishDto.toString());
        dishService.saveWithFlavor(dishDto);
        return R.success("新增菜品成功");
    }

    /**
     * 菜品信息分页查询
     *
     * @param page
     * @param pageSize
     * @param name
     * @return
     */
    @GetMapping("/page")
    public R<Page> page(int page, int pageSize, String name) {
        //分页构造器
        Page<Dish> pageInfo = new Page<>(page, pageSize);
        Page<DishDto> dishDtoPage = new Page<>(page, pageSize);
        //条件构造器
        LambdaQueryWrapper<Dish> queryWrapper = new LambdaQueryWrapper<>();
        //添加过滤条件
        queryWrapper.like(name != null, Dish::getName, name);
        //添加排序条件
        queryWrapper.orderByDesc(Dish::getUpdateTime);
        //执行分页查询
        dishService.page(pageInfo, queryWrapper);

        //对象拷贝(将 pageInfo 中，除了records以外的信息拷贝到 dishDtoPage中)
        BeanUtils.copyProperties(pageInfo, dishDtoPage, "records");

        //records中储存的是除分页信息外的信息
        List<Dish> records = pageInfo.getRecords();

        //在 record中增加 分类名称(categoryName)属性
        List<DishDto> list = records.stream().map((item) -> {
            //创建一个 dishDto 对象，用于接收 categoryName(分类名称)
            DishDto dishDto = new DishDto();
            //先将除分类名称外的信息拷贝到 dishDto 中
            BeanUtils.copyProperties(item, dishDto);
            //将records中每个对象的 分类id取出
            Long categoryId = item.getCategoryId();//分类id
            Category category = categoryService.getById(categoryId);
            //通过 分类id 查询 分类名称
            if (category != null) {
                String categoryName = category.getName();
                //设置到dishDto中
                dishDto.setCategoryName(categoryName);
            }
            return dishDto;
        }).collect(Collectors.toList());
        //此时list中已经有categoryName
        dishDtoPage.setRecords(list);
        return R.success(dishDtoPage);
    }

    /**
     * 根据id查询菜品信息和对应的口味信息
     *
     * @param id
     * @return
     */
    @GetMapping("/{id}")
    public R<DishDto> get(@PathVariable Long id) {
        DishDto dishDto = dishService.getByIdWithFlavor(id);
        return R.success(dishDto);
    }

    /**
     * 修改菜品信息和对应的口味信息
     *
     * @param dishDto
     * @return
     */
    @PutMapping
    public R<DishDto> update(@RequestBody DishDto dishDto) {
        dishService.updateWithFlavor(dishDto);

        //清理所有菜品的缓存数据
        //Set keys = redisTemplate.keys("dish_*");
        //redisTemplate.delete(keys);

        //清理某个分类下面的菜品缓存
        String key = "dish_" + dishDto.getCategoryId() + "_1";
        redisTemplate.delete(key);

        return R.success(dishDto);
    }

    /**
     * 根据条件查询对应的菜品数据
     *
     * @param dish
     * @return
     */
    @GetMapping("/list")
    public R<List<DishDto>> list(Dish dish) {
        List<DishDto> dishDtoList = null;

        //动态构造key
        String key = "dish" + dish.getCategoryId() + "_" + dish.getStatus();//dish_1397849739276890114_1

        //先从Redis中获取缓存数据
        dishDtoList = (List<DishDto>) redisTemplate.opsForValue().get(key);
        if (dishDtoList!=null){
            //如果存在，直接返回，无需查询数据库
            return R.success(dishDtoList);
        }
        //如果不存在，需要查询数据库，将查询到的菜品缓存到Redis中
        //设置查询条件
        LambdaQueryWrapper<Dish> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(dish.getCategoryId() != null, Dish::getCategoryId, dish.getCategoryId());
        //查询状态为1的菜品
        queryWrapper.eq(Dish::getStatus, 1);
        //添加排序条件
        queryWrapper.orderByAsc(Dish::getSort).orderByDesc(Dish::getUpdateTime);
        List<Dish> list = dishService.list(queryWrapper);

        dishDtoList = list.stream().map((item) -> {
            //创建一个 dishDto 对象，用于接收 categoryName(分类名称)
            DishDto dishDto = new DishDto();
            //先将除分类名称外的信息拷贝到 dishDto 中
            BeanUtils.copyProperties(item, dishDto);
            //将records中每个对象的 分类id取出
            Long categoryId = item.getCategoryId();//分类id
            Category category = categoryService.getById(categoryId);
            //通过 分类id 查询 分类名称
            if (category != null) {
                String categoryName = category.getName();
                //设置到dishDto中
                dishDto.setCategoryName(categoryName);
            }
            //当前菜品id
            Long dishId = item.getId();
            LambdaQueryWrapper<DishFlavor> lambdaQueryWrapper = new LambdaQueryWrapper<>();
            lambdaQueryWrapper.eq(DishFlavor::getDishId, dishId);
            //SQL:select * from dish_flavor where dish_id = ?
            List<DishFlavor> dishFlavorList = dishFlavorService.list(lambdaQueryWrapper);
            dishDto.setFlavors(dishFlavorList);
            return dishDto;
        }).collect(Collectors.toList());

        //将查询到的菜品缓存到Redis中
        redisTemplate.opsForValue().set(key,dishDtoList,60, TimeUnit.MINUTES);

        return R.success(dishDtoList);
    }
}
